It depends on your definition of "Imperial" or "Double." The category of "Imperial Anything" says alcohol starts at 8%. Statistically, "Double" just means between +30% to outright double the alcohol of the base style, then dryhopped. I round that to 50% more than the mean level alcohol of any style. My "Imperial Pilsner" is 6%, lower than the guidelines, but that's where it tastes right.
Imperial Red Ale cuts across several potential styles. Hoppy? Then Oginme's suggestion works. Boozy? Then it might fit better as a Barleywine. Many classic English Barleywines fit the red color (Old Nick).
Style guidelines shouldn't define your beer. Guidelines are created from what brewers make and want to repeat. Guidelines are best when they provide direction and education to brew, then feedback about how well you can hit a target, once brewed.